powerpc: Make cpu_to_chip_id() available when SMP=n

Up until now we have only used cpu_to_chip_id() in the topology code,
which is only used on SMP builds. However my recent commit a4da0d5
"Implement arch_get_random_long/int() for powernv" added a usage when
SMP=n, breaking the build.

Move cpu_to_chip_id() into prom.c so it is available for SMP=n builds.

We would move the extern to prom.h, but that breaks the include in
topology.h. Instead we leave it in smp.h, but move it out of the
CONFIG_SMP #ifdef. We also need to include asm/smp.h in rng.c, because
the linux version skips asm/smp.h on UP. What a mess.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/smp.h b/arch/powerpc/include/asm/smp.h
index 98da78e0c2c0eeda19f1852faa725742aa43af76..084e0807db988e2a24b836df800406739f91a7e9 100644 (file)
--- a/arch/powerpc/include/asm/smp.h
+++ b/arch/powerpc/include/asm/smp.h
@@ -33,6 +33,7 @@ extern int boot_cpuid;
 extern int spinning_secondaries;
 
 extern void cpu_die(void);
+extern int cpu_to_chip_id(int cpu);
 
 #ifdef CONFIG_SMP
 
@@ -112,7 +113,6 @@ static inline struct cpumask *cpu_core_mask(int cpu)
 }
 
 extern int cpu_to_core_id(int cpu);
-extern int cpu_to_chip_id(int cpu);
 
 /* Since OpenPIC has only 4 IPIs, we use slightly different message numbers.
  *

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index f3a47098fb8e90b31e98a7d2808f6e691064e363..fa0ad8aafbccf3950506a96a64f75bc2141f1bd7 100644 (file)
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -777,6 +777,26 @@ int of_get_ibm_chip_id(struct device_node *np)
        return -1;
 }
 
+/**
+ * cpu_to_chip_id - Return the cpus chip-id
+ * @cpu: The logical cpu number.
+ *
+ * Return the value of the ibm,chip-id property corresponding to the given
+ * logical cpu number. If the chip-id can not be found, returns -1.
+ */
+int cpu_to_chip_id(int cpu)
+{
+       struct device_node *np;
+
+       np = of_get_cpu_node(cpu, NULL);
+       if (!np)
+               return -1;
+
+       of_node_put(np);
+       return of_get_ibm_chip_id(np);
+}
+EXPORT_SYMBOL(cpu_to_chip_id);
+
 #ifdef CONFIG_PPC_PSERIES
 /*
  * Fix up the uninitialized fields in a new device node:

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 930cd8af35035441031e1abecbdde3472ab48808..a3b64f3bf9a298b057cfdc57b008ea01eebecf63 100644 (file)
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -597,22 +597,6 @@ out:
        return id;
 }
 
-/* Return the value of the chip-id property corresponding
- * to the given logical cpu.
- */
-int cpu_to_chip_id(int cpu)
-{
-       struct device_node *np;
-
-       np = of_get_cpu_node(cpu, NULL);
-       if (!np)
-               return -1;
-
-       of_node_put(np);
-       return of_get_ibm_chip_id(np);
-}
-EXPORT_SYMBOL(cpu_to_chip_id);
-
 /* Helper routines for cpu to core mapping */
 int cpu_core_index_of_thread(int cpu)
 {

diff --git a/arch/powerpc/platforms/powernv/rng.c b/arch/powerpc/platforms/powernv/rng.c
index 8844628915dc4770b8d9ce35f4a03ab9dee5e94c..1cb160dc1609a5be5dbfd17ff0bfcbeaf362829b 100644 (file)
--- a/arch/powerpc/platforms/powernv/rng.c
+++ b/arch/powerpc/platforms/powernv/rng.c
@@ -19,6 +19,7 @@
 #include <asm/io.h>
 #include <asm/prom.h>
 #include <asm/machdep.h>
+#include <asm/smp.h>
 
 
 struct powernv_rng {